body {
  background-color: #eaeaea;
}
.playground {
  margin: 50px auto;
  position: relative;
  width: 700px;
}
#score {
  font-size: 20px;
}
.help {
  position: absolute;
  right: -24%;
  top: 10%;
}
.help li {
  height: 40px;
  font-size: 18px;
}
table {
  border-collapse: collapse;
  border: 1px solid #000;
}
td {
  width: 27px;
  height: 27px;
  text-align: center;
  color: red;
  border: 1px solid #000;
}

.over {
  position: absolute;
  top: 40%;
  left: 40%;
  width: 200px;
  height: 150px;
  border: 1px solid #333;
  background-color: #cccccc;
  padding: 15px;
  box-shadow: 0px 0px 10px #000;
  border-radius: 5px;
  text-align: center;
  display: none;
}

.start {
  position: absolute;
  top: 40%;
  left: 40%;
  width: 200px;
  height: 150px;
  border: 1px solid #333;
  background-color: #cccccc;
  padding: 15px;
  box-shadow: 0px 0px 10px #000;
  border-radius: 5px;
  text-align: center;
  display: block;
}

#final-score {
  font-size: 18px;
  padding: 10px;
  color: slateblue;
}

.start button {
  width: 80%;
  height: 50px;
  background-color: #fff;
  cursor: pointer;
}
.start button:hover {
  color: #fff;
  background-color: #2568f6;
}

.over button {
  width: 80%;
  height: 50px;
  background-color: #fff;
  cursor: pointer;
}
.over button:hover {
  color: #fff;
  background-color: #2568f6;
}
